Abstract

Diffusion of Fe in solar-grade (CIGSe) layers was investigated over the temperature range from 200 to . Either natural or radioactive iron was diffused from the front-surface of CIGSe/Mo/soda lime glass samples. Penetration profiles of stable and radioactive were measured by secondary ion mass spectrometry(SIMS) and ion-beamsputtering in conjunction with activity counting, respectively. The Fe diffusivity can be described by the Arrhenius equation . Taking into account Fe solubility data obtained from the SIMS profiles, we provide evidence that is representative of diffusion along grain boundaries.